try {
    // Get event context for registering listener
    EventDirContext ctx = (EventDirContext)(new InitialContext(env).lookup("ou=People"));

    // Create listener
    NamingListener listener = new SampleObjListener();

    // Specify to search the subtree
    SearchControls ctls = new SearchControls();

    // Specify the search filter of objects in which you're interested
    // Ask for objects that have "mail" attribute
    String filter = "(mail=*)";

    // Register listener for object change events
    ctx.addNamingListener("cn=John", filter, ctls, listener);
} catch (NamingException e) {

public class SampleObjListener implements ObjectChangeListener {
    public SampleObjListener() {
    public void objectChanged(NamingEvent evt) {
    public void namingExceptionThrown(NamingExceptionEvent evt) {

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